Highly anticipated X38 chipset is expected sometimes in October. The chipsets will go out sooner but it takes some time to finish the motherboards.
P35 is just slightly improved version of P965 chipset with support for 45 nanometre CPUs and better FSB 1333 support and X38 should be the real McCoy with support for better memory overclocking. This is something that P35 lacks and that the big X38 brother tends to fix.
X38 will of course be just in time to team with Yorkfield and Wolfdale so you don’t have anything to worry about.